package com.hmdp.utils;


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {
    //开始时间戳
    private static final long BEGIN_TIMESTAMP = 1640995200L;
    //序列号的位数
    private static final long COUNT_BITS = 32;
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    public RedisIdWorker(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    public long nextId(String keyPrefix) {
        //生成时间戳
        LocalDateTime now=LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;
        //生成序列号
        //获取当前日期，精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        long count = stringRedisTemplate.opsForValue().increment("icr:"+keyPrefix+":"+date);
        //拼接并返回

        return timestamp << COUNT_BITS | count;
    }
    public static  void main(String[] args) {
        LocalDateTime  time = LocalDateTime.of(2022,1,1,0,0,0);
        long second = time.toEpochSecond(ZoneOffset.UTC);
        System.out.println(second);
    }

}
